Multiple link communication constraint

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive, when operating in a multiple link communication system, one or more downlink control information (DCI) messages scheduling one or more downlink communications. The user equipment may determine, based at least in part on the one or more DCI messages, whether a communication constraint is satisfied for the one or more downlink communications. The user equipment may determine a communication configuration for the one or more downlink communications based at least in part on whether the communication constraint is satisfied. The user equipment may receive, in the multiple link communication system, the one or more downlink communications based at least in part on the communication configuration. Numerous other aspects are provided.

CROSS-REFERENCE TO RELATED APPLICATIONS UNDER 35 U.S.C. § 119

This application claims priority to Greek Patent Application No.20180100371, filed on Aug. 7, 2018, entitled “MULTIPLE LINKCOMMUNICATION CONSTRAINT,” which is hereby expressly incorporated byreference herein.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wirelesscommunication, and more particularly to techniques and apparatuses formultiple link communication constraint.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, and/or the like). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency-division multipleaccess (FDMA) systems, orthogonal frequency-division multiple access(OFDMA) systems, single-carrier frequency-division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LTE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless communication network may include a number of base stations(BSs) that can support communication for a number of user equipment(UEs). A user equipment (UE) may communicate with a base station (BS)via the downlink and uplink. The downlink (or forward link) refers tothe communication link from the BS to the UE, and the uplink (or reverselink) refers to the communication link from the UE to the BS. As will bedescribed in more detail herein, a BS may be referred to as a Node B, agNB, an access point (AP), a radio head, a transmit receive point (TRP),a New Radio (NR) BS, a 5G Node B, and/or the like.

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent user equipment to communicate on a municipal, national,regional, and even global level. New Radio (NR), which may also bereferred to as 5G, is a set of enhancements to the LTE mobile standardpromulgated by the Third Generation Partnership Project (3GPP). NR isdesigned to better support mobile broadband Internet access by improvingspectral efficiency, lowering costs, improving services, making use ofnew spectrum, and better integrating with other open standards usingorthogonal frequency division multiplexing (OFDM) with a cyclic prefix(CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g.,also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) onthe uplink (UL), as well as supporting beamforming, multiple-inputmultiple-output (MIMO) antenna technology, and carrier aggregation.However, as the demand for mobile broadband access continues toincrease, there exists a need for further improvements in LTE and NRtechnologies. Preferably, these improvements should be applicable toother multiple access technologies and the telecommunication standardsthat employ these technologies.

SUMMARY

In some aspects, a method of wireless communication, performed by a userequipment (UE), may include receiving, when operating in a multiple linkcommunication system, one or more downlink control information (DCI)messages scheduling one or more downlink communications. The method mayinclude determining, based at least in part on the one or more DCImessages, whether a communication constraint is satisfied for the one ormore downlink communications. The method may include determining acommunication configuration for the one or more downlink communicationsbased at least in part on whether the communication constraint issatisfied. The method may include receiving, in the multiple linkcommunication system, the one or more downlink communications based atleast in part on the communication configuration.

In some aspects, a user equipment for wireless communication may includememory and one or more processors operatively coupled to the memory. Thememory and the one or more processors may be configured to receive, whenoperating in a multiple link communication system, one or more DCImessages scheduling one or more downlink communications. The memory andthe one or more processors may be configured to determine, based atleast in part on the one or more DCI messages, whether a communicationconstraint is satisfied for the one or more downlink communications. Thememory and the one or more processors may be configured to determine acommunication configuration for the one or more downlink communicationsbased at least in part on whether the communication constraint issatisfied. The memory and the one or more processors may be configuredto receive, in the multiple link communication system, the one or moredownlink communications based at least in part on the communicationconfiguration.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a userequipment, may cause the one or more processors to receive, whenoperating in a multiple link communication system, one or more DCImessages scheduling one or more downlink communications. The one or moreinstructions, when executed by the one or more processors of the userequipment, may cause the one or more processors to determine, based atleast in part on the one or more DCI messages, whether a communicationconstraint is satisfied for the one or more downlink communications. Theone or more instructions, when executed by the one or more processors ofthe user equipment, may cause the one or more processors to determine acommunication configuration for the one or more downlink communicationsbased at least in part on whether the communication constraint issatisfied. The one or more instructions, when executed by the one ormore processors of the user equipment, may cause the one or moreprocessors to receive, in the multiple link communication system, theone or more downlink communications based at least in part on thecommunication configuration.

In some aspects, an apparatus for wireless communication may includemeans for receiving, when operating in a multiple link communicationsystem, one or more DCI messages scheduling one or more downlinkcommunications. The apparatus may include means for determining, basedat least in part on the one or more DCI messages, whether acommunication constraint is satisfied for the one or more downlinkcommunications. The apparatus may include means for determining acommunication configuration for the one or more downlink communicationsbased at least in part on whether the communication constraint issatisfied. The apparatus may include means for receiving, in themultiple link communication system, the one or more downlinkcommunications based at least in part on the communicationconfiguration.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, wireless communication device, and/or processing system assubstantially described herein with reference to and as illustrated bythe accompanying drawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims. Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purposesof illustration and description, and not as a definition of the limitsof the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only certain typical aspects of this disclosure andare therefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a block diagram conceptually illustrating an example of awireless communication network, in accordance with various aspects ofthe present disclosure.

FIG. 2 is a block diagram conceptually illustrating an example of a basestation in communication with a user equipment (UE) in a wirelesscommunication network, in accordance with various aspects of the presentdisclosure.

FIG. 3A is a block diagram conceptually illustrating an example of aframe structure in a wireless communication network, in accordance withvarious aspects of the present disclosure.

FIG. 3B is a block diagram conceptually illustrating an examplesynchronization communication hierarchy in a wireless communicationnetwork, in accordance with various aspects of the present disclosure.

FIG. 4 is a block diagram conceptually illustrating an example slotformat with a normal cyclic prefix, in accordance with various aspectsof the present disclosure.

FIG. 5 illustrates an example logical architecture of a distributedradio access network (RAN), in accordance with various aspects of thepresent disclosure.

FIG. 6 illustrates an example physical architecture of a distributedRAN, in accordance with various aspects of the present disclosure.

FIG. 7 is a diagram illustrating an example of multiple linkcommunication constraint, in accordance with various aspects of thepresent disclosure.

FIG. 8 is a diagram illustrating an example process performed, forexample, by a user equipment, in accordance with various aspects of thepresent disclosure.

DETAILED DESCRIPTION

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and should not be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. Based at least inpart on the teachings herein one skilled in the art should appreciatethat the scope of the disclosure is intended to cover any aspect of thedisclosure disclosed herein, whether implemented independently of orcombined with any other aspect of the disclosure. For example, anapparatus may be implemented or a method may be practiced using anynumber of the aspects set forth herein. In addition, the scope of thedisclosure is intended to cover such an apparatus or method which ispracticed using other structure, functionality, or structure andfunctionality in addition to or other than the various aspects of thedisclosure set forth herein. It should be understood that any aspect ofthe disclosure disclosed herein may be embodied by one or more elementsof a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, and/or the like(collectively referred to as “elements”). These elements may beimplemented using hardware, software, or combinations thereof. Whethersuch elements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

It should be noted that while aspects may be described herein usingterminology commonly associated with 3G and/or 4G wireless technologies,aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

FIG. 1 is a diagram illustrating a network 100 in which aspects of thepresent disclosure may be practiced. The network 100 may be an LTEnetwork or some other wireless network, such as a 5G or NR network.Wireless network 100 may include a number of BSs 110 (shown as BS 110 a,BS 110 b, BS 110 c, and BS 110 d) and other network entities. A BS is anentity that communicates with user equipments (UEs) and may also bereferred to as a base station, a NR BS, a Node B, a gNB, a 5G node B(NB), an access point, a transmit receive point (TRP), and/or the like.Each BS may provide communication coverage for a particular geographicarea. In 3GPP, the term “cell” can refer to a coverage area of a BSand/or a BS subsystem serving this coverage area, depending on thecontext in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or another type of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a closed subscriber group (CSG)). ABS for a macro cell may bereferred to as a macro BS. ABS for a pico cell may be referred to as apico BS. A BS for a femto cell may be referred to as a femto BS or ahome BS. In the example shown in FIG. 1, a BS 110 a may be a macro BSfor a macro cell 102 a, a BS 110 b may be a pico BS for a pico cell 102b, and a BS 110 c may be a femto BS for a femto cell 102 c. A BS maysupport one or multiple (e.g., three) cells. The terms “eNB”, “basestation”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” maybe used interchangeably herein.

In some aspects, a cell may not necessarily be stationary, and thegeographic area of the cell may move according to the location of amobile BS. In some aspects, the BSs may be interconnected to one anotherand/or to one or more other BSs or network nodes (not shown) in theaccess network 100 through various types of backhaul interfaces such asa direct physical connection, a virtual network, and/or the like usingany suitable transport network.

Wireless network 100 may also include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (e.g., a BS or a UE) and send a transmission of the data to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that can relay transmissions for other UEs. In the example shown inFIG. 1, a relay station 110 d may communicate with macro BS 110 a and aUE 120 d in order to facilitate communication between BS 110 a and UE120 d. A relay station may also be referred to as a relay BS, a relaybase station, a relay, and/or the like.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/orthe like. These different types of BSs may have different transmit powerlevels, different coverage areas, and different impact on interferencein wireless network 100. For example, macro BSs may have a high transmitpower level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relayBSs may have lower transmit power levels (e.g., 0.1 to 2 Watts).

A network controller 130 may couple to a set of BSs and may providecoordination and control for these BSs. Network controller 130 maycommunicate with the BSs via a backhaul. The BSs may also communicatewith one another, e.g., directly or indirectly via a wireless orwireline backhaul.

UEs 120 (e.g., 120 a, 120 b, 120 c, 120 d, 120 e) may be dispersedthroughout wireless network 100, and each UE may be stationary ormobile. A UE may also be referred to as an access terminal, a terminal,a mobile station, a subscriber unit, a station, and/or the like. A UEmay be a cellular phone (e.g., a smart phone), a personal digitalassistant (PDA), a wireless modem, a wireless communication device, ahandheld device, a laptop computer, a cordless phone, a wireless localloop (WLL) station, a tablet, a camera, a gaming device, a netbook, asmartbook, an ultrabook, a medical device or equipment, biometricsensors/devices, wearable devices (smart watches, smart clothing, smartglasses, smart wrist bands, smart jewelry (e.g., smart ring, smartbracelet)), an entertainment device (e.g., a music or video device, or asatellite radio), a vehicular component or sensor, smart meters/sensors,industrial manufacturing equipment, a global positioning system device,or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, location tags, and/or the like, that may communicate with abase station, another device (e.g., remote device), or some otherentity. A wireless node may provide, for example, connectivity for or toa network (e.g., a wide area network such as Internet or a cellularnetwork) via a wired or wireless communication link. Some UEs may beconsidered Internet-of-Things (IoT) devices, and/or may be implementedas NB-IoT (narrowband internet of things) devices. Some UEs may beconsidered a Customer Premises Equipment (CPE). UE 120 may be includedinside a housing that houses components of UE 120, such as processorcomponents, memory components, and/or the like.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular RAT andmay operate on one or more frequencies. A RAT may also be referred to asa radio technology, an air interface, and/or the like. A frequency mayalso be referred to as a carrier, a frequency channel, and/or the like.Each frequency may support a single RAT in a given geographic area inorder to avoid interference between wireless networks of different RATs.In some cases, NR or 5G RAT networks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120 a and UE 120e) may communicate directly using one or more sidelink channels (e.g.,without using a base station 110 as an intermediary to communicate withone another). For example, the UEs 120 may communicate usingpeer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (e.g., which mayinclude a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure(V2I) protocol, and/or the like), a mesh network, and/or the like. Inthis case, the UE 120 may perform scheduling operations, resourceselection operations, and/or other operations described elsewhere hereinas being performed by the base station 110.

As indicated above, FIG. 1 is provided merely as an example. Otherexamples may differ from what is described with regard to FIG. 1.

FIG. 2 shows a block diagram of a design 200 of base station 110 and UE120, which may be one of the base stations and one of the UEs in FIG. 1.Base station 110 may be equipped with T antennas 234 a through 234 t,and UE 120 may be equipped with R antennas 252 a through 252 r, where ingeneral T≥1 and R≥1.

At base station 110, a transmit processor 220 may receive data from adata source 212 for one or more UEs, select one or more modulation andcoding schemes (MCS) for each UE based at least in part on channelquality indicators (CQIs) received from the UE, process (e.g., encodeand modulate) the data for each UE based at least in part on the MCSselected for the UE, and provide data symbols for all UEs. Transmitprocessor 220 may also process system information (e.g., for semi-staticresource partitioning information (SRPI) and/or the like) and controlinformation (e.g., CQI requests, grants, upper layer signaling, and/orthe like) and provide overhead symbols and control symbols. Transmitprocessor 220 may also generate reference symbols for reference signals(e.g., the cell-specific reference signal (CRS)) and synchronizationsignals (e.g., the primary synchronization signal (PSS) and secondarysynchronization signal (SSS)). A transmit (TX) multiple-inputmultiple-output (MIMO) processor 230 may perform spatial processing(e.g., precoding) on the data symbols, the control symbols, the overheadsymbols, and/or the reference symbols, if applicable, and may provide Toutput symbol streams to T modulators (MODs) 232 a through 232 t. Eachmodulator 232 may process a respective output symbol stream (e.g., forOFDM and/or the like) to obtain an output sample stream. Each modulator232 may further process (e.g., convert to analog, amplify, filter, andupconvert) the output sample stream to obtain a downlink signal. Tdownlink signals from modulators 232 a through 232 t may be transmittedvia T antennas 234 a through 234 t, respectively. According to variousaspects described in more detail below, the synchronization signals canbe generated with location encoding to convey additional information.

At UE 120, antennas 252 a through 252 r may receive the downlink signalsfrom base station 110 and/or other base stations and may providereceived signals to demodulators (DEMODs) 254 a through 254 r,respectively. Each demodulator 254 may condition (e.g., filter, amplify,downconvert, and digitize) a received signal to obtain input samples.Each demodulator 254 may further process the input samples (e.g., forOFDM and/or the like) to obtain received symbols. A MIMO detector 256may obtain received symbols from all R demodulators 254 a through 254 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 258 may process (e.g.,demodulate and decode) the detected symbols, provide decoded data for UE120 to a data sink 260, and provide decoded control information andsystem information to a controller/processor 280. A channel processormay determine reference signal received power (RSRP), received signalstrength indicator (RSSI), reference signal received quality (RSRQ),channel quality indicator (CQI), and/or the like. In some aspects, oneor more components of UE 120 may be included in a housing.

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (e.g., forreports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) fromcontroller/processor 280. Transmit processor 264 may also generatereference symbols for one or more reference signals. The symbols fromtransmit processor 264 may be precoded by a TX MIMO processor 266 ifapplicable, further processed by modulators 254 a through 254 r (e.g.,for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to basestation 110. At base station 110, the uplink signals from UE 120 andother UEs may be received by antennas 234, processed by demodulators232, detected by a MIMO detector 236 if applicable, and furtherprocessed by a receive processor 238 to obtain decoded data and controlinformation sent by UE 120. Receive processor 238 may provide thedecoded data to a data sink 239 and the decoded control information tocontroller/processor 240. Base station 110 may include communicationunit 244 and communicate to network controller 130 via communicationunit 244. Network controller 130 may include communication unit 294,controller/processor 290, and memory 292.

Controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform one ormore techniques associated with multiple link communication constraint,as described in more detail elsewhere herein. For example,controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform or directoperations of, for example, process 800 of FIG. 8 and/or other processesas described herein. Memories 242 and 282 may store data and programcodes for base station 110 and UE 120, respectively. A scheduler 246 mayschedule UEs for data transmission on the downlink and/or uplink.

In some aspects, UE 120 may include means for receiving, when operatingin a multiple link communication system, one or more downlink controlinformation (DCI) messages scheduling one or more downlinkcommunications; means for determining, based at least in part on the oneor more DCI messages, whether a communication constraint is satisfiedfor the one or more downlink communications; means for determining acommunication configuration for the one or more downlink communicationsbased at least in part on whether the communication constraint issatisfied; means for receiving, in the multiple link communicationsystem, the one or more downlink communications based at least in parton the communication configuration; and/or the like. In some aspects,such means may include one or more components of UE 120 described inconnection with FIG. 2.

As indicated above, FIG. 2 is provided merely as an example. Otherexamples may differ from what is described with regard to FIG. 2.

FIG. 3A shows an example frame structure 300 for frequency divisionduplexing (FDD) in a telecommunications system (e.g., NR). Thetransmission timeline for each of the downlink and uplink may bepartitioned into units of radio frames (sometimes referred to asframes). Each radio frame may have a predetermined duration (e.g., 10milliseconds (ms)) and may be partitioned into a set of Z (Z≥1)subframes (e.g., with indices of 0 through Z−1). Each subframe may havea predetermined duration (e.g., 1 ms) and may include a set of slots(e.g., 2^(m) slots per subframe are shown in FIG. 3A, where m is anumerology used for a transmission, such as 0, 1, 2, 3, 4, and/or thelike). Each slot may include a set of L symbol periods. For example,each slot may include fourteen symbol periods (e.g., as shown in FIG.3A), seven symbol periods, or another number of symbol periods. In acase where the subframe includes two slots (e.g., when m=1), thesubframe may include 2L symbol periods, where the 2L symbol periods ineach subframe may be assigned indices of 0 through 2L−1. In someaspects, a scheduling unit for the FDD may frame-based, subframe-based,slot-based, symbol-based, and/or the like.

While some techniques are described herein in connection with frames,subframes, slots, and/or the like, these techniques may equally apply toother types of wireless communication structures, which may be referredto using terms other than “frame,” “subframe,” “slot,” and/or the likein 5G NR. In some aspects, a wireless communication structure may referto a periodic time-bounded communication unit defined by a wirelesscommunication standard and/or protocol. Additionally, or alternatively,different configurations of wireless communication structures than thoseshown in FIG. 3A may be used.

In certain telecommunications (e.g., NR), a base station may transmitsynchronization signals. For example, a base station may transmit aprimary synchronization signal (PSS), a secondary synchronization signal(SSS), and/or the like, on the downlink for each cell supported by thebase station. The PSS and SSS may be used by UEs for cell search andacquisition. For example, the PSS may be used by UEs to determine symboltiming, and the SSS may be used by UEs to determine a physical cellidentifier, associated with the base station, and frame timing. The basestation may also transmit a physical broadcast channel (PBCH). The PBCHmay carry some system information, such as system information thatsupports initial access by UEs.

In some aspects, the base station may transmit the PSS, the SSS, and/orthe PBCH in accordance with a synchronization communication hierarchy(e.g., a synchronization signal (SS) hierarchy) including multiplesynchronization communications (e.g., SS blocks), as described below inconnection with FIG. 3B.

FIG. 3B is a block diagram conceptually illustrating an example SShierarchy, which is an example of a synchronization communicationhierarchy. As shown in FIG. 3B, the SS hierarchy may include an SS burstset, which may include a plurality of SS bursts (identified as SS burst0 through SS burst B−1, where B is a maximum number of repetitions ofthe SS burst that may be transmitted by the base station). As furthershown, each SS burst may include one or more SS blocks (identified as SSblock 0 through SS block (b_(max_SS)−1), where b_(max_SS)−1 is a maximumnumber of SS blocks that can be carried by an SS burst). In someaspects, different SS blocks may be beam-formed differently. An SS burstset may be periodically transmitted by a wireless node, such as every Xmilliseconds, as shown in FIG. 3B. In some aspects, an SS burst set mayhave a fixed or dynamic length, shown as Y milliseconds in FIG. 3B.

The SS burst set shown in FIG. 3B is an example of a synchronizationcommunication set, and other synchronization communication sets may beused in connection with the techniques described herein. Furthermore,the SS block shown in FIG. 3B is an example of a synchronizationcommunication, and other synchronization communications may be used inconnection with the techniques described herein.

In some aspects, an SS block includes resources that carry the PSS, theSSS, the PBCH, and/or other synchronization signals (e.g., a tertiarysynchronization signal (TSS)) and/or synchronization channels. In someaspects, multiple SS blocks are included in an SS burst, and the PSS,the SSS, and/or the PBCH may be the same across each SS block of the SSburst. In some aspects, a single SS block may be included in an SSburst. In some aspects, the SS block may be at least four symbol periodsin length, where each symbol carries one or more of the PSS (e.g.,occupying one symbol), the SSS (e.g., occupying one symbol), and/or thePBCH (e.g., occupying two symbols).

In some aspects, the symbols of an SS block are consecutive, as shown inFIG. 3B. In some aspects, the symbols of an SS block arenon-consecutive. Similarly, in some aspects, one or more SS blocks ofthe SS burst may be transmitted in consecutive radio resources (e.g.,consecutive symbol periods) during one or more slots. Additionally, oralternatively, one or more SS blocks of the SS burst may be transmittedin non-consecutive radio resources.

In some aspects, the SS bursts may have a burst period, whereby the SSblocks of the SS burst are transmitted by the base station according tothe burst period. In other words, the SS blocks may be repeated duringeach SS burst. In some aspects, the SS burst set may have a burst setperiodicity, whereby the SS bursts of the SS burst set are transmittedby the base station according to the fixed burst set periodicity. Inother words, the SS bursts may be repeated during each SS burst set.

The base station may transmit system information, such as systeminformation blocks (SIBs) on a physical downlink shared channel (PDSCH)in certain slots. The base station may transmit control information/dataon a physical downlink control channel (PDCCH) in C symbol periods of aslot, where B may be configurable for each slot. The base station maytransmit traffic data and/or other data on the PDSCH in the remainingsymbol periods of each slot.

As indicated above, FIGS. 3A and 3B are provided as examples. Otherexamples may differ from what is described with regard to FIGS. 3A and3B.

FIG. 4 shows an example slot format 410 with a normal cyclic prefix. Theavailable time frequency resources may be partitioned into resourceblocks. Each resource block may cover a set to of subcarriers (e.g., 12subcarriers) in one slot and may include a number of resource elements.Each resource element may cover one subcarrier in one symbol period(e.g., in time) and may be used to send one modulation symbol, which maybe a real or complex value.

An interlace structure may be used for each of the downlink and uplinkfor FDD in certain telecommunications systems (e.g., NR). For example, Qinterlaces with indices of 0 through Q−1 may be defined, where Q may beequal to 4, 6, 8, 10, or some other value. Each interlace may includeslots that are spaced apart by Q frames. In particular, interlace q mayinclude slots q, q+Q, q+2Q, etc., where q∈{0, Q−1}.

A UE may be located within the coverage of multiple BSs. One of theseBSs may be selected to serve the UE. The serving BS may be selectedbased at least in part on various criteria such as received signalstrength, received signal quality, path loss, and/or the like. Receivedsignal quality may be quantified by a signal-to-noise-and-interferenceratio (SNIR), or a reference signal received quality (RSRQ), or someother metric. The UE may operate in a dominant interference scenario inwhich the UE may observe high interference from one or more interferingBSs.

While aspects of the examples described herein may be associated with NRor 5G technologies, aspects of the present disclosure may be applicablewith other wireless communication systems. New Radio (NR) may refer toradios configured to operate according to a new air interface (e.g.,other than Orthogonal Frequency Divisional Multiple Access (OFDMA)-basedair interfaces) or fixed transport layer (e.g., other than InternetProtocol (IP)). In aspects, NR may utilize OFDM with a CP (hereinreferred to as cyclic prefix OFDM or CP-OFDM) and/or SC-FDM on theuplink, may utilize CP-OFDM on the downlink and include support forhalf-duplex operation using time division duplexing (TDD). In aspects,NR may, for example, utilize OFDM with a CP (herein referred to asCP-OFDM) and/or discrete Fourier transform spread orthogonalfrequency-division multiplexing (DFT-s-OFDM) on the uplink, may utilizeCP-OFDM on the downlink and include support for half-duplex operationusing TDD. NR may include Enhanced Mobile Broadband (eMBB) servicetargeting wide bandwidth (e.g., 80 megahertz (MHz) and beyond),millimeter wave (mmW) targeting high carrier frequency (e.g., 60gigahertz (GHz)), massive MTC (mMTC) targeting non-backward compatibleMTC techniques, and/or mission critical targeting ultra-reliable lowlatency communications (URLLC) service.

In some aspects, a single component carrier bandwidth of 100 MHz may besupported. NR resource blocks may span 12 sub-carriers with asub-carrier bandwidth of 60 or 120 kilohertz (kHz) over a 0.1 msduration. Each radio frame may include 40 slots and may have a length of10 ms. Consequently, each slot may have a length of 0.25 ms. Each slotmay indicate a link direction (e.g., DL or UL) for data transmission andthe link direction for each slot may be dynamically switched. Each slotmay include DL/UL data as well as DL/UL control data.

Beamforming may be supported and beam direction may be dynamicallyconfigured. MIMO transmissions with precoding may also be supported.MIMO configurations in the DL may support up to 8 transmit antennas withmulti-layer DL transmissions up to 8 streams and up to 2 streams per UE.Multi-layer transmissions with up to 2 streams per UE may be supported.Aggregation of multiple cells may be supported with up to 8 servingcells. Alternatively, NR may support a different air interface, otherthan an OFDM-based interface. NR networks may include entities suchcentral units or distributed units.

As indicated above, FIG. 4 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 4.

FIG. 5 illustrates an example logical architecture of a distributed RAN500, according to aspects of the present disclosure. A 5G access node506 may include an access node controller (ANC) 502. The ANC may be acentral unit (CU) of the distributed RAN 500. The backhaul interface tothe next generation core network (NG-CN) 504 may terminate at the ANC.The backhaul interface to neighboring next generation access nodes(NG-ANs) may terminate at the ANC. The ANC may include one or more TRPs508 (which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs,gNB, or some other term). As described above, a TRP may be usedinterchangeably with “cell.”

The TRPs 508 may be a distributed unit (DU). The TRPs may be connectedto one ANC (ANC 502) or more than one ANC (not illustrated). Forexample, for RAN sharing, radio as a service (RaaS), and servicespecific AND deployments, the TRP may be connected to more than one ANC.A TRP may include one or more antenna ports. The TRPs may be configuredto individually (e.g., dynamic selection) or jointly (e.g., jointtransmission) serve traffic to a UE.

The local architecture of RAN 500 may be used to illustrate fronthauldefinition. The architecture may be defined that support fronthaulingsolutions across different deployment types. For example, thearchitecture may be based at least in part on transmit networkcapabilities (e.g., bandwidth, latency, and/or jitter).

The architecture may share features and/or components with LTE.According to aspects, the next generation AN (NG-AN) 510 may supportdual connectivity with NR. The NG-AN may share a common fronthaul forLTE and NR.

The architecture may enable cooperation between and among TRPs 508. Forexample, cooperation may be preset within a TRP and/or across TRPs viathe ANC 502. According to aspects, no inter-TRP interface may beneeded/present.

According to aspects, a dynamic configuration of split logical functionsmay be present within the architecture of RAN 500. The packet dataconvergence protocol (PDCP), radio link control (RLC), media accesscontrol (MAC) protocol may be adaptably placed at the ANC or TRP.

According to various aspects, a BS may include a central unit (CU)(e.g., ANC 502) and/or one or more distributed units (e.g., one or moreTRPs 508).

As indicated above, FIG. 5 is provided merely as an example. Otherexamples may differ from what is described with regard to FIG. 5.

FIG. 6 illustrates an example physical architecture of a distributed RAN600, according to aspects of the present disclosure. A centralized corenetwork unit (C-CU) 602 may host core network functions. The C-CU may becentrally deployed. C-CU functionality may be offloaded (e.g., toadvanced wireless services (AWS)), in an effort to handle peak capacity.

A centralized RAN unit (C-RU) 604 may host one or more ANC functions.Optionally, the C-RU may host core network functions locally. The C-RUmay have distributed deployment. The C-RU may be closer to the networkedge.

A distributed unit (DU) 606 may host one or more TRPs. The DU may belocated at edges of the network with radio frequency (RF) functionality.

As indicated above, FIG. 6 is provided merely as an example. Otherexamples may differ from what is described with regard to FIG. 6.

In some communications systems, such as 5G or NR, a UE may communicateusing a plurality of links. For example, in a multi-beam communicationsystem, the UE may communicate with one or more BSs using a plurality ofbeams. Additionally, or alternatively, in a multipletransmission/reception point (multi-TRP) communication system, the UEmay communicate with a plurality of BSs, which may be termedtransmission/reception points (TRPs). In this way, the UE may transmitand/or receive a communication with improved reliability, improvedthroughput, and/or the like relative to a single link communicationsystem. For example, a plurality of TRPs may jointly transmit a physicaldownlink control channel (PDCCH) communication, a physical downlinkshared channel (PDSCH) communication, a reference signal, and/or thelike to a single UE.

One or more BSs may provide one or more downlink control information(DCI) messages to schedule one or more communications, such as one ormore PDSCHs. For example, the one or more BSs may provide a single DCImessage to schedule a plurality of PDSCHs, a plurality of DCI messagesto schedule a single PDSCH, a plurality of DCI messages to schedule aplurality of PDSCHs, and/or the like. A DCI message may includeinformation identifying one or more parameters, such as a frequencydomain resource assignment parameter, an allocation parameter, a timedomain allocation parameter, a virtual resource block (VRB)/physicalresource block (PRB) mapping parameter, a PRB bundling parameter, aphysical resource group (PRG) parameter, and/or the like.

However, based at least in part on receiving the one or more DCIs, a UEmay receive a set of parameters, which may result in excessive UEprocessing requirements, excessive UE memory utilization requirements,excessive UE power resource utilization requirements, and/or the like.For example, a UE may receive one or more DCIs for one or more PDSCHsthat identify a plurality of VRB/PRB parameters, a plurality of resourceallocation parameters, and/or the like. In this case, some UEs may notbe associated with a UE capability of processing, storing, and/or thelike the plurality of parameters, which may result in the UE failing tosuccessfully process the one or more DCIs for the one or more PDSCHs,and failing to successfully receive and process the one or more PDSCHs.

Some aspects described herein provide multiple link communicationconstraints. For example, a UE may determine a communicationconfiguration based at least in part on whether a communicationconstraint relating to a UE capability and/or a transmission scenario issatisfied, and may receive one or more communications using thecommunication configuration. In this way, the UE may reduce a UEcomplexity, a processing utilization, a memory utilization, an energyresources utilization, and/or the like relative to not enforcing thecommunication constraint.

FIG. 7 is a diagram illustrating an example 700 of multiple linkcommunication constraint, in accordance with various aspects of thepresent disclosure. As shown in FIG. 7, example 700 includes a first BS110-1 communicating with a second BS 110-2 via a backhaul link, and a UE120 communicating with first BS 110-1 and second BS 110-2 via a firstaccess link and a second access link, respectively.

As further shown in FIG. 7, and by reference number 705, UE 120 mayprovide a communication constraint identifier. For example, UE 120 maytransmit a message to first BS 110-1, to second BS 110-2, to first BS110-1 and second BS 110-2, and/or the like, identifying a set ofcommunication constraints for limiting scheduling of a downlink channelcommunication, such as a PDSCH, to reduce a utilization of processingresources, memory resources, energy resources, and/or the like by UE120. Additionally, or alternatively, UE 120 may identify a set ofcommunication constraints relating to a PDCCH, a reference signal,and/or the like.

In some aspects, UE 120 may determine the set of communicationconstraints to provide to, for example, first BS 110-1 based at least inpart on a UE capability of UE 120. For example, UE 120 may determinethat a particular communication constraint is to be enforced by first BS110-1 based at least in part on a type of UE of UE 120, a processingcapability of UE 120, a timing characteristic of UE 120 relating toswitching between frequency resources, and/or the like. In this case, UE120 may provide the communication constraint identifier to identify theparticular communication constraint. In some aspects, UE 120 may provideinformation identifying a scenario in which the particular communicationconstraint is to be enforced, as described in more detail below. Forexample, UE 120 may determine that a particular communication constraintis applicable in a particular scenario, such as a communicationconstraint relating to using a common VRB/PRB mapping value for eachPDSCH being applicable when each PDSCH is associated with a commoncomponent carrier or a common bandwidth part. In this case, UE 120 mayprovide information identifying the particular scenario to cause, forexample, first BS 110-1 to provide one or more DCI messages scheduling aplurality of PDSCHs that use the common VRB/PRB mapping value when theplurality of PDSCHs are scheduled for the common component carrier orthe common bandwidth part.

In some aspects, UE 120 may determine a communication constraint basedat least in part on a parameter associated with an operating conditionof UE 120. For example, UE 120 may determine that UE 120 is associatedwith a particular carrier aggregation mode, and may transmit thecommunication constraint identifier to first BS 110-1 to indicate that aparticular communication constraint is to be enforced while UE 120operates in the particular carrier aggregation mode. In some aspects, UE120 may determine the communication constraint based at least in part ona configuration of UE 120. For example, when UE 120 is configured forjoint processing of demodulation reference signals (DMRSs), softcombining of log likelihood ratios (LLRs), and/or the like, UE 120 mayindicate a particular set of communication constraints, and may indicatea different set of communication constraints when UE 120 is notconfigured for joint processing or soft combining. Similarly, UE 120 mayset a communication constraint that UE 120 is to receive PDSCHs thatinclude a common transport block (TB). Additionally, or alternatively,UE 120 may determine the particular set of communication constraintsbased at least in part on whether a plurality of PDSCHs, which are to bescheduled by one or more DCI messages, are configured for DMRS bundling.In some aspects, UE 120 may determine different communicationconstraints depending on a quantity of PDCCHs or PDSCHs that UE 120 isto receive or a quantity of quasi-co-location (QCL) assumptionsassociated with the PDCCHs or PDSCHs. For example, if there are only 2PDSCHs scheduled, UE 120 may determine not to apply a communicationconstraint, but if there are 4 PDSCHs, UE 120 may apply a communicationconstraint. In some aspects, UE 120 may determine a communicationconstraint for a DMRS pattern. For example, when time domain allocationsare fully overlapped or completely disjoint, UE 120 may use a commonDMRS pattern (e.g., symbol location, quantity of front-loaded DMRSs,and/or the like) for each PDSCH.

In some aspects, UE 120 may determine a communication constraint basedat least in part on information relating to a downlink channelcommunication that UE 120 is to receive. For example, when UE 120 isscheduled for 2 PDSCHs, UE 120 may not indicate a communicationconstraint, but when UE 120 is scheduled for 4 PDSCHs, UE 120 mayindicate a communication constraint to reduce a scheduling complexityrelating to the 4 PDSCHs. In some aspects, UE 120 may determine acommunication constraint based at least in part on a quantity of layersthat UE 120 is scheduled at in each slot or symbol. For example, UE 120may determine, based at least in part on the quantity of layers, that aparticular spacing between the layers is to be enforced for UE 120.

In some aspects, a BS, such as first BS 110-1, may determine one or morecommunication constraints for UE 120 without receiving a communicationconstraint indicator. For example, first BS 110-1 may store informationindicating that a first scenario is to be associated with a first set ofcommunication constraints and a second scenario is to be associated witha second set of communication constraints. In this case, first BS 110-1may determine that the first set of communication constraints areapplicable in the first scenario, and may determine to enforce the firstset of constraints in one or more DCI messages scheduling one or morePDSCHs for the first scenario.

In some aspects, BSs 110 may exchange one or more messages associatedwith indicating communication constraints. For example, based at leastin part on first BS 110-1 receiving the communication constraintindicator, first BS 110-1 may provide the communication constraintindicator to second BS 110-2 via the backhaul link. Additionally, oralternatively, first BS 110-1 may provide scheduling informationassociated with causing second BS 110-2 to schedule a downlink channelin accordance with the communication constraints. For example, first BS110-1 may indicate that second BS 110-2 is to use a particular parameterfor scheduling a downlink channel, thereby satisfying a communicationconstraint applicable to a scenario associated with the downlinkchannel.

As further shown in FIG. 7, and by reference numbers 710, UE 120 mayreceive one or more DCI messages from one or more BSs 110. For example,UE 120 may receive a first set of DCI messages from first BS 110-1, asecond set of DCI messages from second BS 110-2, and/or the like. Insome aspects, UE 120 may receive a single DCI message. For example, UE120 may receive a single DCI message associated with scheduling a singlePDSCH associated with one or more quasi-co-location (QCL) parameters.Additionally, or alternatively, UE 120 may receive a single DCI messageassociated with scheduling a plurality of PDSCHs. In this case, eachPDSCH, of the plurality of PDSCHs, may be associated with a particularQCL parameter.

In some aspects, UE 120 may receive a plurality of DCI messages. Forexample, UE 120 may receive a plurality of DCI messages associated withscheduling a single PDSCH. In this case, UE 120 may receive a first DCImessage from first BS 110-1 to schedule the single PDSCH and a secondDCI message from second BS 110-2 to schedule the single PDSCH, and thesingle PDSCH may be associated with one or more QCL parameters.Additionally, or alternatively, UE 120 may receive a plurality of DCImessages associated with scheduling a plurality of PDSCHs. For example,UE 120 may receive a first DCI message from first BS 110-1 scheduling afirst PDSCH with a first QCL parameter, and may receive a second DCImessage from second BS 110-2 scheduling a second PDSCH with a second QCLparameter.

In some aspects, UE 120 may receive the plurality of DCI messages usinga particular network resource. For example, UE 120 may receive theplurality of DCI messages using a common bandwidth part, a commoncomponent carrier, and/or the like. Additionally, or alternatively, UE120 may receive a first subset of the plurality of DCI messages via afirst bandwidth part or a first component carrier, and may receive asecond subset of the plurality of DCI messages via a second bandwidthpart or a second component carrier.

In some aspects, UE 120 may identify a particular set of parametersassociated with the one or more DCI messages. For example, UE 120 maydetermine a VRB/PRB mapping parameter, a resource allocation typeparameter, a time domain allocation parameter, a PRG value parameter,and/or the like. Additionally, or alternatively, UE 120 may determine aDMRS pattern parameter, a frequency domain resource assignmentparameter, and/or the like.

As further shown in FIG. 7, and by reference number 715, UE 120 maydetermine whether a communication constraint is satisfied for the one ormore PDSCHs scheduled by the one or more DCI messages. For example, UE120 may determine a scenario associated with the one or more PDSCHs(e.g., that a plurality of PDSCHs are scheduled by the one or more DCImessages), and may determine whether a corresponding communicationconstraint (e.g., that the plurality of PDSCHs are to be associated witha common VRB/PRB mapping value) is satisfied by the one or more DCImessages (e.g., that the one or more DCI messages indicate a commonVRB/PRB mapping value).

In some aspects, UE 120 may determine whether an allocation typecommunication constraint is applicable (e.g., a scenario for theallocation type communication constraint is applicable) and satisfied.For example, UE 120 may determine whether each allocation, identified bythe one or more DCI messages, for the one or more PDSCHs are of a sametype. In this case, UE 120 may determine that the allocation typecommunication constraint is satisfied based at least in part on eachallocation being a type 0 allocation, each allocation being a type 1allocation, and/or the like. In some aspects, when a plurality of PDSCHsare non-overlapping in frequency resources and/or time resources, UE 120may determine that the allocation type communication constraint is notapplicable.

In some aspects, UE 120 may determine whether a component carriercommunication constraint is satisfied. For example, UE 120 may determinewhether a set of allocations associated with a common component carrierare associated with a common PRG grid. In this case, based at least inpart on the set of allocations being associated with the common PRGgrid, UE 120 may determine that the component carrier communicationconstraint is satisfied.

In some aspects, UE 120 may determine whether a PRG communicationconstraint is satisfied. For example, when UE 120 supports dynamic PRGand UE 120 receives a single DCI message including an indicator of a PRGbit, UE 120 may determine whether a single PRG is configured for a PDSCHscheduled by the single DCI message. In this case, based at least inpart on a single PRG being configured for the PDSCH, UE 120 maydetermine that the PRG communication constraint is satisfied.Additionally, or alternatively, when UE 120 supports dynamic PRG and UE120 receives a plurality of DCI messages that include PRG bits, UE 120may determine whether each of the plurality of DCI messages indicates acommon PRG grid for PDSCHs scheduled by the plurality of DCI messages.In this case, based at least in part on each of the plurality of DCImessages indicating the common PRG grid, UE 120 may determine that thePRG communication constraint is satisfied. In some aspects, when a firstPDSCH and a second PDSCH are fully disjoint or fully overlapping infrequency or time (e.g., using different component carriers or bandwidthparts), UE 120 may determine the PRG communication constraint is notapplicable.

In some aspects, UE 120 may determine whether a DMRS communicationconstraint is satisfied. For example, when UE 120 does not supportdynamic PRG, and UE 120 is scheduled for a plurality of PDSCHs, UE 120may determine whether a common PRG is indicated for use for DMRS CEs ofthe plurality of PDSCHs. In this case, when the common PRG is indicated,UE 120 may determine that the DMRS communication constraint issatisfied. In some aspects, UE 120 may determine, based at least in parton determining that frequency domain or time domain assignments for thePDSCHs are disjoint, that the DMRS communication constraint is notapplicable. Similarly, when UE 120 determines that a plurality of PDSCHsare scheduled for a plurality of different component carriers orbandwidth parts of a common component carrier, UE 120 may determine thatthe DMRS communication constraint is not applicable.

In some aspects, UE 120 may determine whether a VRB/PRB mappingcommunication constraint is satisfied. For example, UE 120 may determinethat a single VRB/PRB mapping value is used for each DCI messagescheduling each PDSCH, and may determine that the VRB/PRB communicationconstraint is satisfied. In some aspects, when UE 120 determines that asingle DCI message schedules a plurality of PDSCHs across a plurality ofcomponent carriers or bandwidth parts, UE 120 may determine that theVRB/PRB mapping communication constraint is not applicable.

In some aspects, UE 120 may determine whether a time domain allocationcommunication constraint is satisfied. For example, UE 120 may determinethat a plurality of PDSCHs scheduled by the one or more DCI messages arefully overlapping or fully disjoint (i.e., not partially overlapping),and may determine that the time domain allocation communicationconstraint is satisfied.

A plurality of different constraints have been described above. Inpractice, any single constraint or any combination of constraints may beused in a particular scenario.

As further shown in FIG. 7, and by reference number 720, UE 120 maydetermine a communication configuration based at least in part onwhether a communication constraint is satisfied. For example, based atleast in part on determining that one or more applicable communicationconstraints are satisfied, UE 120 may determine to communicate inaccordance with the one or more communication constraints. In this way,UE 120 determines a communication configuration associated with areduced processing utilization, a reduced memory utilization, a reducedenergy resource utilization, and/or the like relative to not enforcingthe communication constraint.

In some aspects, UE 120 may determine to use a particular storedparameter rather than an indicated parameter based at least in part ondetermining that an applicable communication constraint (e.g., the DMRSprocessing communication constraint) is not satisfied. For example, UE120 may determine to use an RRC configured PRG of a particular PDSCHassociated with a particular BS (e.g., first BS 110-1) rather than otherPRGs associated with other PDSCHs. Similarly, UE 120 may determine touse a stored value for the PRG rather than a plurality of indicated PRGsof the one or more DCI messages. Similarly, UE 120 may determine to usea smallest PRG value indicated in the one or more DCI messages ratherthan one or more other PRG values indicated in the one or more DCImessages. In this way, UE 120 may determine to satisfy the communicationconstraint (e.g., to use a single common PRG for DMRS CEs of a pluralityof PDSCHs) that is not enforced by first BS 110-1, second BS 110-2,and/or the like.

Additionally, or alternatively, based at least in part on determiningthat an applicable communication constraint is not satisfied, UE 120 maydetermine a communication configuration associated with dropping one ormore downlink channels. For example, UE 120 may determine, based atleast in part on stored information identifying a response to theapplicable communication constraint not being satisfied and when aplurality of PDSCHs are scheduled by the one or more DCI messages, todecode a subset of the plurality of PDSCHs. Additionally, oralternatively, UE 120 may determine to demodulate a subset of theplurality of PDSCHs. In this way, UE 120 may conserve processingresources, memory resources, energy resources, and/or the like relativeto processing and/or decoding all of the plurality of PDSCHs.

Additionally, or alternatively, UE 120 may determine to process all ofthe plurality of PDSCHs, but may determine to process the plurality ofPDSCHs using a particular PRG (e.g., that is different from a pluralityof indicated PRGs of the one or more DCI messages). Additionally, oralternatively, when the downlink channel includes a plurality of PDCCHs,UE 120 may determine to process all of the PDCCHs using a communicationconfiguration associated with a single PDCCH of the plurality of PDCCHs(e.g., that is different from communication configurations associatedwith other PDCCHs of the plurality of PDCCHs). In this way, UE 120reduces a processing utilization, a memory utilization, an energyresource utilization, and/or the like relative to determining acommunication configuration in accordance with the one or more DCImessages.

As further shown in FIG. 7, and by reference numbers 725, UE 120 mayreceive a downlink channel, such as a PDSCH, in accordance with thecommunication configuration. Additionally, or alternatively, UE 120 mayreceive a PDCCH, a reference signal, and/or the like. For example, UE120 may receive one or more downlink channels in accordance with thecommunication configuration (e.g., in accordance with the communicationconstraint, in accordance with a configured response to thecommunication constraint not being satisfied, such as dropping one ormore downlink channels, using a stored value for a parameter, and/or thelike).

In some aspects, based at least in part on an applicable communicationconstraint not being satisfied, UE 120 may perform joint DMRSestimation. For example, UE 120 may perform joint DMRS estimation acrossa plurality of PDSCHs. In some aspects, based at least in part on theapplicable communication constraint not being satisfied, UE 120 mayperform soft combining (e.g., of LLRs). In some aspects, based at leastin part on the applicable communication constraint not being satisfiedfor a particular PDSCH of a plurality of PDSCHs signaled by the one ormore DCI messages, UE 120 may determine to drop the particular PDSCH(e.g., not receive or not process the particular PDSCH).

In some aspects, based at least in part on receiving the one or morePDSCHs, UE 120 may decode the one or more PDSCHs as described above.Additionally, or alternatively, UE 120 may process the one or morePDSCHs, provide a response associated with the one or more PDSCHs,and/or the like.

As indicated above, FIG. 7 is provided as an example. Other examples maydiffer from what is described with respect to FIG. 7.

FIG. 8 is a diagram illustrating an example process 800 performed, forexample, by a UE, in accordance with various aspects of the presentdisclosure. Example process 800 is an example where a UE (e.g., UE 120)performs multiple link communication constraint.

As shown in FIG. 8, in some aspects, process 800 may include receiving,when operating in a multiple link communication system, one or moredownlink control information (DCI) messages scheduling one or moredownlink communications (block 810). For example, the UE (e.g., usingantenna 252, DEMOD 254, MIMO detector 256, receive processor 258,controller/processor 280, and/or the like) may receive, when operatingin a multiple link communication system, one or more DCI messagesscheduling one or more downlink communications, as described in moredetail above.

As shown in FIG. 8, in some aspects, process 800 may includedetermining, based at least in part on the one or more DCI messages,whether a communication constraint is satisfied for the one or moredownlink communications (block 820). For example, the UE (e.g., usingcontroller/processor 280 and/or the like) may determine, based at leastin part on the one or more DCI messages, whether a communicationconstraint is satisfied for the one or more downlink communications, asdescribed in more detail above.

As shown in FIG. 8, in some aspects, process 800 may include determininga communication configuration for the one or more downlinkcommunications based at least in part on whether the communicationconstraint is satisfied (block 830). For example, the UE (e.g., usingcontroller/processor 280 and/or the like) may determine a communicationconfiguration for the one or more downlink communications based at leastin part on whether the communication constraint is satisfied, asdescribed in more detail above.

As shown in FIG. 8, in some aspects, process 800 may include receiving,in the multiple link communication system, the one or more downlinkcommunications based at least in part on the communication configuration(block 840). For example, the UE (e.g., using antenna 252, DEMOD 254,MIMO detector 256, receive processor 258, controller/processor 280,and/or the like) may receive, in the multiple link communication system,the one or more downlink communications based at least in part on thecommunication configuration, as described in more detail above.

Process 800 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

With respect to process 800, in a first aspect, the communicationconstraint is based at least in part on a quantity of the one or moredownlink communications.

With respect to process 800, in a second aspect, alone or in combinationwith the first aspect, the one or more downlink communications includeat least one of: one or more physical downlink control channels, one ormore physical downlink shared channels, or one or more referencesignals.

With respect to process 800, in a third aspect, alone or in combinationwith one or more of the first and second aspects, the communicationconstraint is satisfied based at least in part on time allocations forthe one or more downlink communications overlapping and a commondemodulation reference signal pattern being used for the one or moredownlink communications.

With respect to process 800, in a fourth aspect, alone or in combinationwith one or more of the first through third aspects, the communicationconstraint is based at least in part on whether the user equipment is tosoft combine log-likelihood ratios of the downlink communications.

With respect to process 800, in a fifth aspect, alone or in combinationwith one or more of the first through fourth aspects, the communicationconstraint is based at least in part on whether the downlinkcommunications include a common transport block.

With respect to process 800, in a sixth aspect, alone or in combinationwith one or more of the first through fifth aspects, the UE isconfigured to determine a demodulation reference signal DMRS patternparameter or a frequency domain resource assignment parameter inconnection with the one or more DCI messages.

With respect to process 800, in a seventh aspect, alone or incombination with one or more of the first through sixth aspects, process800 includes providing information identifying the communicationconstraint to cause the communication constraint to be enforced by atransmission/reception point (TRP) of the multiple link communicationsystem.

With respect to process 800, in an eighth aspect, alone or incombination with one or more of the first through seventh aspects, theuser equipment is configured to determine the communication constraintbased at least in part on a channel quantity parameter or a channelquality parameter.

With respect to process 800, in a ninth aspect, alone or in combinationwith one or more of the first through eighth aspects, the communicationconstraint is based at least in part on a parameter relating to at leastone of a quantity of layers scheduled for the user equipment, a carrieraggregation mode of the user equipment, a demodulation reference signalprocessing configuration, a demodulation reference signal bundlingconfiguration, a soft combining configuration, or a downlinkcommunication timing configuration.

With respect to process 800, in a tenth aspect, alone or in combinationwith one or more of the first through ninth aspects, the user equipmentis configured to receive the one or more downlink communications inaccordance with a common allocation based at least in part on thecommunication configuration.

With respect to process 800, in an eleventh aspect, alone or incombination with one or more of the first through tenth aspects, aplurality of allocations associated with the one or more downlinkcommunications are associated with a common component carrier, and theuser equipment is configured to use a common physical resource group(PRG) grid for the plurality of allocations based at least in part onthe communication configuration.

With respect to process 800, in a twelfth aspect, alone or incombination with one or more of the first through eleventh aspects, theDCI includes a PRG bit and the user equipment is configured to supportdynamic PRG and to receive the one or more downlink communications usinga common PRG based at least in part on the communication configuration.

With respect to process 800, in a thirteenth aspect, alone or incombination with one or more of the first through twelfth aspects, theuser equipment is not configured to support a dynamic PRG, and the userequipment is configured to use a common PRG for a demodulation referencesignal (DMRS) of the one or more downlink communications based at leastin part on the communication configuration.

With respect to process 800, in a fourteenth aspect, alone or incombination with one or more of the first through thirteenth aspects,the common PRG is associated with a downlink communication, of the oneor more downlink communications, associated with a particular basestation.

With respect to process 800, in a fifteenth aspect, alone or incombination with one or more of the first through fourteenth aspects,the user equipment is configured to determine the common PRG based atleast in part on a stored value for the common PRG.

With respect to process 800, in a sixteenth aspect, alone or incombination with one or more of the first through fifteenth aspects, theuser equipment is configured to determine the common PRG based at leastin part on a smallest PRG indicator value of a set of PRG indicatorvalues.

With respect to process 800, in a seventeenth aspect, alone or incombination with one or more of the first through sixteenth aspects, aDCI message, of the one or more DCI messages, identifies a particularvirtual resource block (VRB)/physical resource block (PRB) mappingvalue, and the user equipment is configured to receive the one or moredownlink communications using the particular VRB/PRB mapping value andbased at least in part on the communication configuration.

With respect to process 800, in an eighteenth aspect, alone or incombination with one or more of the first through seventeenth aspects,the user equipment is configured to receive the one or more downlinkcommunications using a fully overlapping time domain allocation or afully disjoint time domain allocation based at least in part on thecommunication configuration.

With respect to process 800, in a nineteenth aspect, alone or incombination with one or more of the first through eighteenth aspects,the user equipment is configured to use a common stored DMRS pattern forall of the one or more downlink communications based at least in part onthe communication configuration.

With respect to process 800, in a twentieth aspect, alone or incombination with one or more of the first through nineteenth aspects,the user equipment is configured to use a DMRS pattern associated with alargest quantity of DMRS symbols, relative to one or more othercandidate DMRS patterns, for all of the one or more downlinkcommunications based at least in part on the communicationconfiguration.

With respect to process 800, in a twenty-first aspect, alone or incombination with one or more of the first through twentieth aspects, theuser equipment is configured to use a DMRS pattern associated with aparticular base station for all of the one or more downlinkcommunications based at least in part on the communicationconfiguration.

With respect to process 800, in a twenty-second aspect, alone or incombination with one or more of the first through twenty-first aspects,the user equipment is configured to use a DMRS pattern of the downlinkcommunication channel scheduled by a particular core resource set forall of the one or more downlink communications based at least in part onthe communication configuration.

With respect to process 800, in a twenty-third aspect, alone or incombination with one or more of the first through twenty-second aspects,the multiple link communication system is a multiple beam communicationsystem or a multiple transmission/reception point (multi-TRP)communication system.

With respect to process 800, in a twenty-fourth aspect, alone or incombination with one or more of the first through twenty-third aspects,the one or more DCI messages associated with the one or more downlinkcommunications may be associated with one or more bandwidth parts of oneor more component carriers.

With respect to process 800, in a twenty-fifth aspect, alone or incombination with one or more of the first through twenty-fourth aspects,the communication constraint is not satisfied and the user equipment isconfigured to determine, as the communication configuration to decode asubset of the one or more downlink communications, demodulate the subsetof the one or more downlink communications, process the one or moredownlink communications based at least in part on a stored communicationparameter that is different from an indicated communication parameter ofthe one or more DCI messages, or process the one or more downlinkcommunications based at least in part on a first indicated communicationparameter of a first downlink communication, of the one or more downlinkcommunications, that is different from a second indicated communicationparameter, of a second downlink communication of the one or moredownlink communications.

With respect to process 800, in a twenty-sixth aspect, alone or incombination with one or more of the first through twenty-fifth aspects,the user equipment is configured to provide information identifying auser equipment capability to identify the communication constraint and acommunication scenario under which the communication constraint is to besatisfied, and the user equipment is configured to indicate that thecommunication constraint is to be enforced for the one or more DCImessages.

Although FIG. 8 shows example blocks of process 800, With respect toprocess 800, in some aspects, process 800 may include additional blocks,fewer blocks, different blocks, or differently arranged blocks thanthose depicted in FIG. 8. Additionally, or alternatively, two or more ofthe blocks of process 800 may be performed in parallel.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseform disclosed. Modifications and variations may be made in light of theabove disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, or a combination of hardware and software. Asused herein, a processor is implemented in hardware, firmware, or acombination of hardware and software.

As used herein, satisfying a threshold may, depending on the context,refer to a value being greater than the threshold, greater than or equalto the threshold, less than the threshold, less than or equal to thethreshold, equal to the threshold, not equal to the threshold, and/orthe like.

It will be apparent that systems and/or methods described herein may beimplemented in different forms of hardware, firmware, or a combinationof hardware and software. The actual specialized control hardware orsoftware code used to implement these systems and/or methods is notlimiting of the aspects. Thus, the operation and behavior of the systemsand/or methods were described herein without reference to specificsoftware code—it being understood that software and hardware can bedesigned to implement the systems and/or methods based, at least inpart, on the description herein.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. In fact, many ofthese features may be combined in ways not specifically recited in theclaims and/or disclosed in the specification. Although each dependentclaim listed below may directly depend on only one claim, the disclosureof various aspects includes each dependent claim in combination withevery other claim in the claim set. A phrase referring to “at least oneof” a list of items refers to any combination of those items, includingsingle members. As an example, “at least one of: a, b, or c” is intendedto cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combinationwith multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c,a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering ofa, b, and c).

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Furthermore,as used herein, the terms “set” and “group” are intended to include oneor more items (e.g., related items, unrelated items, a combination ofrelated and unrelated items, and/or the like), and may be usedinterchangeably with “one or more.” Where only one item is intended, theterm “only one” or similar language is used. Also, as used herein, theterms “has,” “have,” “having,” and/or the like are intended to beopen-ended terms. Further, the phrase “based on” is intended to mean“based, at least in part, on” unless explicitly stated otherwise.

What is claimed is:
 1. A method of wireless communication performed by auser equipment, comprising: receiving, when operating in a multiple linkcommunication system, one or more downlink control information (DCI)messages scheduling one or more downlink communications; determining,based at least in part on the one or more DCI messages, whether acommunication constraint is satisfied for the one or more downlinkcommunications; determining a communication configuration for the one ormore downlink communications based at least in part on whether thecommunication constraint is satisfied; and receiving, in the multiplelink communication system, the one or more downlink communications basedat least in part on the communication configuration.
 2. The method ofclaim 1, wherein the communication constraint is based at least in parton a quantity of the one or more downlink communications.
 3. The methodof claim 1, wherein the one or more downlink communications include atleast one of: one or more physical downlink control channels, one ormore physical downlink shared channels, or one or more referencesignals.
 4. The method of claim 1, wherein the communication constraintis satisfied based at least in part on time allocations for the one ormore downlink communications completely overlapping and a commondemodulation reference signal pattern being used for the one or moredownlink communications.
 5. The method of claim 1, wherein thecommunication constraint is based at least in part on whether the userequipment is to soft combine log-likelihood ratios of the downlinkcommunications.
 6. The method of claim 1, wherein the communicationconstraint is based at least in part on whether the downlinkcommunications include a common transport block.
 7. The method of claim1, wherein a demodulation reference signal pattern parameter or afrequency domain resource assignment parameter is determined inconnection with the one or more DCI messages.
 8. The method of claim 1,further comprising: providing information identifying the communicationconstraint to cause the communication constraint to be enforced by atransmission/reception point of the multiple link communication system.9. The method of claim 1, wherein the communication constraint isdetermined based at least in part on a channel quantity parameter or achannel quality parameter.
 10. The method of claim 1, wherein thecommunication constraint is based at least in part on a parameterrelating to at least one of a quantity of layers scheduled for the userequipment, a carrier aggregation mode of the user equipment, ademodulation reference signal processing configuration, a demodulationreference signal bundling configuration, a soft combining configuration,or a downlink communication timing configuration.
 11. The method ofclaim 1, wherein the one or more downlink communications are received inaccordance with a common allocation based at least in part on thecommunication configuration.
 12. The method of claim 1, wherein aplurality of allocations associated with the one or more downlinkcommunications are associated with a common component carrier, andwherein a common physical resource group grid is used for the pluralityof allocations based at least in part on the communicationconfiguration.
 13. The method of claim 1, wherein the DCI includes aphysical resource group (PRG) bit and dynamic PRG is supported, andwherein the one or more downlink communications are received using acommon PRG based at least in part on the communication configuration.14. The method of claim 1, wherein a dynamic physical resource group(PRG) is not supported, and wherein a common PRG is used for ademodulation reference signal (DMRS) of the one or more downlinkcommunications based at least in part on the communicationconfiguration.
 15. The method of claim 14, wherein the common PRG isassociated with a downlink communication, of the one or more downlinkcommunications, associated with a particular base station.
 16. Themethod of claim 14, wherein the common PRG is determined based at leastin part on a stored value for the common PRG.
 17. The method of claim14, wherein the common PRG is determined based at least in part on asmallest PRG indicator value of a set of PRG indicator values.
 18. Themethod of claim 1, wherein a DCI message, of the one or more DCImessages, identifies a particular virtual resource block (VRB)/physicalresource block (PRB) mapping value, and wherein the one or more downlinkcommunications are received using the particular VRB/PRB mapping valueand based at least in part on the communication configuration.
 19. Themethod of claim 1, wherein the one or more downlink communications arereceived using a fully overlapping time domain allocation or a fullydisjoint time domain allocation based at least in part on thecommunication configuration.
 20. The method of claim 19, wherein acommon stored demodulation reference signal pattern is used for all ofthe one or more downlink communications based at least in part on thecommunication configuration.
 21. The method of claim 19, wherein ademodulation reference signal (DMRS) pattern associated with a largestquantity of DMRS symbols, relative to one or more other candidate DMRSpatterns, is used for all of the one or more downlink communicationsbased at least in part on the communication configuration.
 22. Themethod of claim 19, wherein a demodulation reference signal patternassociated with a particular base station is used for all of the one ormore downlink communications based at least in part on the communicationconfiguration.
 23. The method of claim 19, wherein a demodulationreference signal pattern of the downlink communication channel scheduledby a particular core resource set is used for all of the one or moredownlink communications based at least in part on the communicationconfiguration.
 24. The method of claim 1, wherein the multiple linkcommunication system is a multiple beam communication system or amultiple transmission/reception point communication system.
 25. Themethod of claim 1, wherein the one or more DCI messages associated withthe one or more downlink communications may be associated with one ormore bandwidth parts of one or more component carriers.
 26. The methodof claim 1, wherein the communication constraint is not satisfied andthe user equipment is configured to determine, as the communicationconfiguration, to: decode a subset of the one or more downlinkcommunications, demodulate the subset of the one or more downlinkcommunications, process the one or more downlink communications based atleast in part on a stored communication parameter that is different froman indicated communication parameter of the one or more DCI messages, orprocess the one or more downlink communications based at least in parton a first indicated communication parameter of a first downlinkcommunication, of the one or more downlink communications, that isdifferent from a second indicated communication parameter, of a seconddownlink communication of the one or more downlink communications. 27.The method of claim 1, wherein information identifying a user equipmentcapability is provided to identify the communication constraint and acommunication scenario under which the communication constraint is to besatisfied, and wherein the communication constraint is indicated to beenforced for the one or more DCI messages.
 28. A user equipment forwireless communication, comprising: a memory; and one or more processorsoperatively coupled to the memory, the memory and the one or moreprocessors configured to: receive, when operating in a multiple linkcommunication system, one or more downlink control information (DCI)messages scheduling one or more downlink communications; determine,based at least in part on the one or more DCI messages, whether acommunication constraint is satisfied for the one or more downlinkcommunications; determine a communication configuration for the one ormore downlink communications based at least in part on whether thecommunication constraint is satisfied; and receive, in the multiple linkcommunication system, the one or more downlink communications based atleast in part on the communication configuration.
 29. A non-transitorycomputer-readable medium storing one or more instructions for wirelesscommunication, the one or more instructions comprising: one or moreinstructions that, when executed by one or more processors of a userequipment, cause the one or more processors to: receive, when operatingin a multiple link communication system, one or more downlink controlinformation (DCI) messages scheduling one or more downlinkcommunications; determine, based at least in part on the one or more DCImessages, whether a communication constraint is satisfied for the one ormore downlink communications; determine a communication configurationfor the one or more downlink communications based at least in part onwhether the communication constraint is satisfied; and receive, in themultiple link communication system, the one or more downlinkcommunications based at least in part on the communicationconfiguration.
 30. An apparatus for wireless communication, comprising:means for receiving, when operating in a multiple link communicationsystem, one or more downlink control information (DCI) messagesscheduling one or more downlink communications; means for determining,based at least in part on the one or more DCI messages, whether acommunication constraint is satisfied for the one or more downlinkcommunications; means for determining a communication configuration forthe one or more downlink communications based at least in part onwhether the communication constraint is satisfied; and means forreceiving, in the multiple link communication system, the one or moredownlink communications based at least in part on the communicationconfiguration.